Area code 202

202Area codes in Washington, D.C.
Area code 202 is the North American telephone area code for Washington, D.C.. The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).wikipedia
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List of original NANP area codes

original area codesoriginal 86 area codesoriginal numbering plan areas
The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).

North American Numbering Plan

Area codeArea codesArea code(s)
The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).
The second area code, 202 was assigned to the District of Columbia.

Overlay plan

overlayoverlaidoverlay area code
As of 2012, no plans exist to overlay the 202 area code, as NANPA estimates the current supply of numbers is sufficient at least to the year 2022.
Every number in Maryland's area code 301 and northern Virginia's 703 was given a "hidden" phone number consisting of the same number in the D.C.'s area code 202, essentially making area code 202 an overlay for the entire region.

Seven-digit dialing

7-digit dialing7-digit diallingseven-digit dialling
Washington is thus one of the largest cities where seven-digit dialing is still possible.
Washington, D.C. (area code 202) to adjacent areas of Maryland (area code 301) and Virginia (area code 703), discontinued on October 1, 1990 to allow assignment of a code in all three area codes.

Washington, D.C.

WashingtonDistrict of ColumbiaWashington, DC
Area code 202 is the North American telephone area code for Washington, D.C..

Area codes 301 and 240

301240 & 301240
From the 1950s to 1990, area code 202 was an unpublished alternate area code for the nearby suburbs in Maryland and Virginia, which were officially in area codes 301 and 703, respectively.
From 1947 to 1990, the telephone numbering plan of the entire Washington metropolitan area, including Washington, D.C. (area code 202), and the large suburban areas in Maryland and Virginia (area code 703), operated in a system of central office code protection, meaning that no central office code in Washington D.C., and in the Maryland and Virginia suburbs could exist in more than a single central office.

Area codes 410, 443, and 667

410, 443, and 667410410 & 443
This did not free up enough numbers to meet demand on either side of the Potomac River, forcing the split of area code 410 from 301 in 1991 and the split of area code 540 from 703 in 1995.
Before these area codes were created, all of Maryland had been served by 301 since the institution of area codes in 1947, even though the state is home to two very large metropolitan areas—Baltimore and the Maryland suburbs of Washington, D.C. (area code 202).

List of North American Numbering Plan area codes

List of North American area codesArea CodesNPA
List of North American Numbering Plan area codes

Area codes 703 and 571

703571571 & 703
From the 1950s to 1990, area code 202 was an unpublished alternate area code for the nearby suburbs in Maryland and Virginia, which were officially in area codes 301 and 703, respectively.
While the Washington metro area is split between three area codes–Maryland's 301, the District's 202, and 703–it was a single local calling area.

North America

NorthNAAmerica
Area code 202 is the North American telephone area code for Washington, D.C..

Telephone

phonetelephonesLocal Telephone Service
Area code 202 is the North American telephone area code for Washington, D.C..

Telephone numbering plan

Area codeCalling codearea codes
Area code 202 is the North American telephone area code for Washington, D.C..

AT&T

AT&T Inc.AT&T Latin AmericaSBC
The area code was one of the original area codes established in October 1947 by AT&T in the North American Numbering Plan (NANP).

Area codes 201 and 551

201area code 201551
After the State of New Jersey with area code 201, the District of Columbia was the second Numbering Plan Area (NPA).

Maryland

MDState of MarylandMd.
From the 1950s to 1990, area code 202 was an unpublished alternate area code for the nearby suburbs in Maryland and Virginia, which were officially in area codes 301 and 703, respectively.

Virginia

VACommonwealth of VirginiaVa.
From the 1950s to 1990, area code 202 was an unpublished alternate area code for the nearby suburbs in Maryland and Virginia, which were officially in area codes 301 and 703, respectively.

Eastern Shore of Maryland

Eastern ShoreMaryland's Eastern ShoreEastern
One side effect was that a central office prefix could only be duplicated in jurisdictions a safe distance from the metropolitan area, such as the Eastern Shore of Maryland or southwestern Virginia.

Potomac River

PotomacSouth Branch Potomac RiverNorth Branch Potomac River
This did not free up enough numbers to meet demand on either side of the Potomac River, forcing the split of area code 410 from 301 in 1991 and the split of area code 540 from 703 in 1995.

Area code 540

540
This did not free up enough numbers to meet demand on either side of the Potomac River, forcing the split of area code 410 from 301 in 1991 and the split of area code 540 from 703 in 1995.

Mobile number portability

number portabilitycarry their original phone number with a new providerMNP
Years after the introduction of mobile number portability, a large number of cell phone customers on the Virginia and Maryland sides of the metro have 202 numbers.

List of future North American area codes

679730227
Others with exhaust dates within five years (by the end of 2023) that currently do not have an approved relief plan and relief area code: 202, 214/469/972, 289/365/905 (742 is reserved for this, but another area code may be chosen), 343/613, 403/587/780/825 (368 is reserved for this, but another area code may be chosen), 405, 450/579 (354 is reserved for this, but another area code may be chosen), 484/610, 516, 540, 757, 806, 813, 814, 850, 909.